Update openid-4-verifiable-credential-issuance-1_0.md

openid-4-verifiable-credential-issuance-1_0.md

@@ -1021,7 +1021,7 @@ If the Wallet is requesting the issuance of a Credential that is not supported b
   * `invalid_credential_request`: The Credential Request is missing a required parameter, includes an unsupported parameter or parameter value, repeats the same parameter, or is otherwise malformed.
   * `unsupported_credential_type`: Requested Credential type is not supported.
   * `unsupported_credential_format`: Requested Credential Format is not supported.
-  * `invalid_proof`: The `proof` or `proofs` parameter in the Credential Request is invalid. For example, this could be because either both fields are missing, both are present simultaneously, one of the provided key proofs is either invalid or if a `c_nonce` was provided by the Credential Issuer, one of the key proofs is not linked to a previously issued valid `c_nonce` value (see (#issuer-provided-nonce)).
+  * `invalid_proof`: The `proof` or `proofs` parameter in the Credential Request is invalid if either both fields are missing, both are present simultaneously, one of the provided key proofs is either invalid or if a `c_nonce` was provided by the Credential Issuer and one of the key proofs is not linked to a previously issued valid `c_nonce` value (refer to (#issuer-provided-nonce)).
   * `invalid_encryption_parameters`: This error occurs when the encryption parameters in the Credential Request are either invalid or missing. In the latter case, it indicates that the Credential Issuer requires the Credential Response to be sent encrypted, but the Credential Request does not contain the necessary encryption parameters.
   * `credential_request_denied`: The Credential Request has not been accepted by the Credential Issuer.
 * `error_description`: OPTIONAL. The `error_description` parameter MUST be a human-readable ASCII [@!USASCII] text, providing any additional information used to assist the Client implementers in understanding the occurred error. The values for the `error_description` parameter MUST NOT include characters outside the set `%x20-21 / %x23-5B / %x5D-7E`.